A137230 - OEIS

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A137230

Numbers that are divisible by the number of their prime factors (excluding primes).

4, 6, 10, 12, 14, 16, 18, 22, 24, 26, 27, 30, 34, 36, 38, 40, 42, 45, 46, 56, 58, 60, 62, 63, 66, 74, 75, 78, 80, 82, 84, 86, 88, 94, 96, 99, 100, 102, 104, 105, 106, 114, 117, 118, 120, 122, 132, 134, 136, 138, 140, 142, 144, 146, 147, 152, 153, 156, 158, 165, 166 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`The sequence (S) is defined by n in S <--> {mod[n,r(n)] = 0 & n NOT prime}. r(n) is equivalent to BigOmega(n). This sequence is obtained from A074946 by excluding all primes within that sequence.`
	LINKS	`Eric Weisstein's MathWorld Prime Factor`
	EXAMPLE	`n = 3; not in S because does not satisfy "n NOT prime."` `n = 4; in S because satisfies both mod[n,r(n)] = 0 and n NOT prime.`
	CROSSREFS	`Cf. A074946.` `Sequence in context: A174240 A163164 A120351 * A181794 A199536 A134333` `Adjacent sequences: A137227 A137228 A137229 * A137231 A137232 A137233`
	KEYWORD	`nonn`
	AUTHOR	`William A. Tedeschi (fynmun(AT)hotmail.com), Mar 07 2008`

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Last modified February 18 00:14 EST 2012. Contains 206085 sequences.